/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.rest.messages.job;

import org.apache.flink.runtime.jobgraph.JobVertexID;
import org.apache.flink.runtime.rest.handler.job.SubtasksAllAccumulatorsHandler;
import org.apache.flink.runtime.rest.messages.ResponseBody;
import org.apache.flink.runtime.rest.messages.json.JobVertexIDDeserializer;
import org.apache.flink.runtime.rest.messages.json.JobVertexIDSerializer;
import org.apache.flink.util.Preconditions;

import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonCreator;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.annotation.JsonSerialize;

import java.util.Collection;
import java.util.Objects;

/**
 * Response type of the {@link SubtasksAllAccumulatorsHandler}.
 */
public class SubtasksAllAccumulatorsInfo implements ResponseBody {

	public static final String FIELD_NAME_JOB_VERTEX_ID = "id";
	public static final String FIELD_NAME_PARALLELISM = "parallelism";
	public static final String FIELD_NAME_SUBTASKS = "subtasks";

	@JsonProperty(FIELD_NAME_JOB_VERTEX_ID)
	@JsonSerialize(using = JobVertexIDSerializer.class)
	private final JobVertexID jobVertexId;

	@JsonProperty(FIELD_NAME_PARALLELISM)
	private final int parallelism;

	@JsonProperty(FIELD_NAME_SUBTASKS)
	private final Collection<SubtaskAccumulatorsInfo> subtaskAccumulatorsInfos;

	@JsonCreator
	public SubtasksAllAccumulatorsInfo(
		@JsonDeserialize(using = JobVertexIDDeserializer.class) @JsonProperty(FIELD_NAME_JOB_VERTEX_ID) JobVertexID jobVertexId,
		@JsonProperty(FIELD_NAME_PARALLELISM) int parallelism,
		@JsonProperty(FIELD_NAME_SUBTASKS) Collection<SubtaskAccumulatorsInfo> subtaskAccumulatorsInfos) {
		this.jobVertexId = Preconditions.checkNotNull(jobVertexId);
		this.parallelism = parallelism;
		this.subtaskAccumulatorsInfos = Preconditions.checkNotNull(subtaskAccumulatorsInfos);
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}
		SubtasksAllAccumulatorsInfo that = (SubtasksAllAccumulatorsInfo) o;
		return Objects.equals(jobVertexId, that.jobVertexId) &&
			parallelism == that.parallelism &&
			Objects.equals(subtaskAccumulatorsInfos, that.subtaskAccumulatorsInfos);
	}

	@Override
	public int hashCode() {
		return Objects.hash(jobVertexId, parallelism, subtaskAccumulatorsInfos);
	}

	// ---------------------------------------------------
	// Static inner classes
	// ---------------------------------------------------

	/**
	 * Detailed information about subtask accumulators.
	 */
	public static class SubtaskAccumulatorsInfo {
		public static final String FIELD_NAME_SUBTASK_INDEX = "subtask";
		public static final String FIELD_NAME_ATTEMPT_NUM = "attempt";
		public static final String FIELD_NAME_HOST = "host";
		public static final String FIELD_NAME_USER_ACCUMULATORS = "user-accumulators";


		@JsonProperty(FIELD_NAME_SUBTASK_INDEX)
		private final int subtaskIndex;

		@JsonProperty(FIELD_NAME_ATTEMPT_NUM)
		private final int attemptNum;

		@JsonProperty(FIELD_NAME_HOST)
		private final String host;

		@JsonProperty(FIELD_NAME_USER_ACCUMULATORS)
		private final Collection<UserAccumulator> userAccumulators;

		@JsonCreator
		public SubtaskAccumulatorsInfo(
			@JsonProperty(FIELD_NAME_SUBTASK_INDEX) int subtaskIndex,
			@JsonProperty(FIELD_NAME_ATTEMPT_NUM) int attemptNum,
			@JsonProperty(FIELD_NAME_HOST) String host,
			@JsonProperty(FIELD_NAME_USER_ACCUMULATORS) Collection<UserAccumulator> userAccumulators) {

			this.subtaskIndex = subtaskIndex;
			this.attemptNum = attemptNum;
			this.host = Preconditions.checkNotNull(host);
			this.userAccumulators = Preconditions.checkNotNull(userAccumulators);
		}

		@Override
		public boolean equals(Object o) {
			if (this == o) {
				return true;
			}
			if (o == null || getClass() != o.getClass()) {
				return false;
			}
			SubtaskAccumulatorsInfo that = (SubtaskAccumulatorsInfo) o;
			return subtaskIndex == that.subtaskIndex &&
				attemptNum == that.attemptNum &&
				Objects.equals(host, that.host) &&
				Objects.equals(userAccumulators, that.userAccumulators);
		}

		@Override
		public int hashCode() {
			return Objects.hash(subtaskIndex, attemptNum, host, userAccumulators);
		}

	}
}
